Phosphavinylidene(oxo)phosphorane Mes*P(O)=C=PMes*: A Diphosphaallene Featuring λ
<sup>5</sup>
σ
<sup>3</sup>
‐ and λ
<sup>3</sup>
σ
<sup>2</sup>
‐Phosphorus Atoms
作者:Raluca Septelean、Henri Ranaivonjatovo、Gabriela Nemes、Jean Escudié、Ioan Silaghi‐Dumitrescu、Heinz Gornitzka、Luminita Silaghi‐Dumitrescu、Stéphane Massou
DOI:10.1002/ejic.200600384
日期:2006.11
ortho-tert-butyl group to the σ3-P=C double bond. Water adds chemoselectively and regioselectively to the λ5σ3-P=C bond, which appears to be more reactive than the λ3σ2-P=C bond. This leads to the hydrolysis compound 8 which has been structurally characterised. The new bis(phosphane oxide)methylene 9 formed from the successive cyclisation of anortho-tert-butyl group to the λ5σ3-P=C bond and addition of water to
Bis(2,4,6-tri-tert-butylphenyl)phosphavinylidene(oxo)phosphorane (1) (Mes* = 2,4,6-tri-tert-butylphenyl),第一个 1λ5σ3,3λ3σ2-diphosphallene,已被合成通过将磷烯基锂 Mes*P=C(Li)Cl 添加到二氯膦氧化物 Mes*P(O)Cl2 中。化合物 1 在固态下是稳定的,但通过在 σ3-P=C 双键上添加一个邻叔丁基的 C-H 键,在溶液中发生缓慢的分子内环化反应。水以化学选择性和区域选择性添加到 λ5σ3-P=C 键,这似乎比 λ3σ2-P=C 键更具反应性。这导致结构上表征的水解化合物8。新的双(氧化膦)亚甲基 9 由邻叔丁基连续环化到 λ5σ3-P=C 键和将水加成到 λ3σ2-P=C 键而形成的结构也已被表征。(© Wiley-VCH Verlag GmbH